The purple waffle plant, also known as red ivy, is a tropical perennial with a prostrate, spreading growth habit and beautiful oval leaves with gray-green tops and purple bottom surfaces. The tiny white flowers that appear in summer are attractive but secondary to the beautiful foliage. Purple waffle plant can be grown as a garden perennial in frost-free climates, but elsewhere it is usually grown as an annual in garden beds or in containers. It also makes an excellent indoor houseplant, since it is known for having excellent air-purifying properties. Normally planted from nursery starts in the spring, purple waffle plant has a relatively slow growth rate. Outdoor plants rarely need any pruning, but some annual trimming may be helpful for indoor houseplants.